/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package org.apache.iotdb.db.mpp.execution.operator.schema;

import org.apache.iotdb.commons.exception.MetadataException;
import org.apache.iotdb.commons.path.PartialPath;
import org.apache.iotdb.db.mpp.common.header.ColumnHeader;
import org.apache.iotdb.db.mpp.common.header.ColumnHeaderConstant;
import org.apache.iotdb.db.mpp.execution.driver.SchemaDriverContext;
import org.apache.iotdb.db.mpp.execution.operator.OperatorContext;
import org.apache.iotdb.db.mpp.plan.planner.plan.node.PlanNodeId;
import org.apache.iotdb.tsfile.file.metadata.enums.TSDataType;
import org.apache.iotdb.tsfile.read.common.block.TsBlock;
import org.apache.iotdb.tsfile.read.common.block.TsBlockBuilder;
import org.apache.iotdb.tsfile.utils.Binary;

import java.util.LinkedList;
import java.util.List;
import java.util.stream.Collectors;

public class PathsUsingTemplateScanOperator extends SchemaQueryScanOperator {

    private final List<PartialPath> pathPatternList;

    private final int templateId;

    private final List<TSDataType> outputDataTypes;

    public PathsUsingTemplateScanOperator(
            PlanNodeId planNodeId,
            OperatorContext context,
            List<PartialPath> pathPatternList,
            int templateId) {
        super(planNodeId, context, 0, 0, null, false);
        this.pathPatternList = pathPatternList;
        this.templateId = templateId;
        this.outputDataTypes =
                ColumnHeaderConstant.showPathsUsingTemplateHeaders.stream()
                        .map(ColumnHeader::getColumnType)
                        .collect(Collectors.toList());
    }

    @Override
    protected List<TsBlock> createTsBlockList() {
        try {
            List<String> schemaRegionResult = new LinkedList<>();
            for (PartialPath pathPattern : pathPatternList) {
                schemaRegionResult.addAll(
                        ((SchemaDriverContext) operatorContext.getInstanceContext().getDriverContext())
                                .getSchemaRegion()
                                .getPathsUsingTemplate(pathPattern, templateId));
            }
            return SchemaTsBlockUtil.transferSchemaResultToTsBlockList(
                    schemaRegionResult.iterator(), outputDataTypes, this::setColumns);
        } catch (MetadataException e) {
            throw new RuntimeException(e.getMessage(), e);
        }
    }

    private void setColumns(String path, TsBlockBuilder builder) {
        builder.getTimeColumnBuilder().writeLong(0L);
        builder.getColumnBuilder(0).writeBinary(new Binary(path));
        builder.declarePosition();
    }
}
